綾香、大輔、ナンシーの会話を聞いて、空所に適切な語を入れましょう。
Daisuke
絶滅
Many of them have lost their ①( ). 理由
People have been cutting down the ②( ).
Nancy
絶滅
About 50％ of them have ③( ). 理由
The temperature of seawater is ④( ).